we'll hear from microsoft, on what's driving the companies' concerns, right after the news summary. an icy, snowy mix made its way into new england today after leaving a messy trail in its wake. ice brought down power lines from texas to tennessee to virginia, and commuters faced hazardous driving this morning. air travel was also a big problem, with another 1,600 flights canceled today. people were stranded all over the country. >> last night the lines for customer service, you couldn't see the end of them. and they were handing out pieces of paper saying call this number. you call the number and all circuits busy. it was just a nightmare. >> ifill: in all, there've been 6,100 flights canceled nationwide since saturday and hundreds more delayed. eight northeast and mid-atlantic states asked today for new federal curbs on air pollution created by their neighbors. they want nine southern and midwestern states to regulate power plant emissions that are carried northeast by prevailing winds. the supreme court hears arguments tomorrow in a related case involving 28 states. south africa